Yellowstone, United-States :

Seismicity
During December 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 46 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a micro earthquake of magnitude 2.3 on December 20, at 01:37 AM MST, located about 12 miles north of the East Entrance Station to Yellowstone National Park. No earthquake swarms were located in December.Yellowstone earthquake activity in December is at low background levels.

The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.